|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | | NA |
| 1993 | 4.63 | NA |
| 1994 | 5.96 | 28.79 % |
| 1995 | 5.26 | -11.76 % |
| 1996 | 7.09 | 34.74 % |
| 1997 | 5.23 | -26.11 % |
| 1998 | 3.72 | -29.02 % |
| 1999 | 4.18 | 12.58 % |
| 2000 | 3.36 | -19.77 % |
| 2001 | 3.06 | -8.78 % |
| 2002 | 3.48 | 13.74 % |
| 2003 | 2.94 | -15.44 % |
| 2004 | 2.84 | -3.44 % |
| 2005 | 2.78 | -2.19 % |
| 2006 | 2.57 | -7.56 % |
| 2007 | 2.69 | 4.55 % |
| 2008 | 2.76 | 2.61 % |
| 2009 | 2.83 | 2.54 % |
| 2010 | 2.90 | 2.48 % |
|
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